Bilateral hydronephrosis

Diseases and Conditions

Hydronephrosis - bilateral

Bilateral hydronephrosis is the enlargement of the parts of the kidney that collect urine. Bilateral means both sides.

Bilateral hydronephrosis occurs when urine is unable to drain from the kidney into the bladder. Hydronephrosis is not itself a disease. It occurs as a result of a problem that prevents urine from draining out of the kidneys, ureters, and bladder.